BlackRock said told staff that they can wear jeans at work

The world’s largest money manager by assets, which has long had a business-casual dress code, told employees Tuesday that it is relaxing the rules further to allow jeans, according to people familiar with the matter.

The $4.7 trillion money manager is the latest large financial firm to allow employees to wear less formal clothing.

'As we continue to look for different ways to enhance our workplace, we’ve decided to expand the business casual dress code firmwide', the US bank said, adding that the new dress code "reflects how the way we work is changing".

"More clients are dressing informally, and many parts of our company are already business casual," JP Morgan said in a memo to staff.

The bank reminded, however, employees not to go too far with their new, more relaxed style: 'It’s critical that we still maintain a highly professional environment. We trust that all of you will use good judgment in what you wear depending on your roles and daily activities'.